A recent preprint paper examines the minimum number of people required to maintain a feasible settlement on Mars while accounting for psychological and behavioral factors, specifically in emergency situations. This study was conducted by a team of data scientists from George Mason University and holds the potential to help researchers better understand the appropriate conditions …
That assumes that everyone will be willing to have children with just about anyone, regardless of their personal opinion of them, and regardless of whether or not they even want children to begin with. You can’t selectively breed humans without massive human rights violations.